/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraSystem.h
void GatherStaticVariables ( [TArray](API\Runtime\Core\Containers\TArray)< [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) > & OutVars, [TArray](API\Runtime\Core\Containers\TArray)< [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) > & OutEmitterVars ) const